Sleeve valve engine



Nov. 14, 1939. v M. IJ-B. BARBAROU SLEEVE VALVE ENGINE Attorney FiledDec. 28, 1937 Patented Nov. 14, 1939 UNlTED STATES SLEEVE VALVE ENGINEMarius Jean-Baptiste Barbarou, Neuilly, Seine, France ApplicationDecember 28, 1937, Serial No. 182,123 In France December 31, 1936 2Claims.

This invention relates to improvements in the internal combustionengines, in which a ported sleeve is interposed between a portedcylinder and the combustion chamber, and the sleeve is 5 movedrelatively to the cylinder to effect the desired opening and closing ofthe ports.

An object of the invention is to ensure a good seal between the sleeveand the ported parts of the cylinder, as otherwise eificiency is lostdue to leakage of fuel between the sleeve and cylinder.

A further object of the invention is to provide ports in the cylinderlocated in members loose in the cylinder and pressed inwardly radiallyagainst the periphery of the ported valves.

In its preferred form the device is constructed of a number of suitablyshaped hollow plugs being fitted slidably in correspondingly shapedradially directed holes in the cylinder, and spring means pressing theinner ends of said plugs radially against the outer surface of thesleeve, the.

inner ends of said plugs being radiused to correspond with thecircumference of the sleeve, said plugs forming termini of passages inthe cylinder and leading to a suitable source, e. g. the source ofsupply of combustible mixture.

The other objects and advantages of the invention are set forth fully inthe description, and the novel features are defined in the appendedclaims. But the disclosure is of course to be taken as explanatory onlyand changes in shape, size, arrangement of parts and mode of operationmay be made without departing from the principle of the invention.

On the drawing,

Fig. l is a sectional elevation on line C--D of Fig. 2 showing indirectapplication of spring pressure to ported members pressed against theported sleeve,

Fig. 2 is a sectional plan view showing a suitable arrangement of portsembodying the above indirect form of ported member, and

Fig. 3 is an enlarged perspective view of a portion of Fig. l.

Referring to the drawing the cylinder I is shown in Figs. 1 and 2 withan inlet port 2 which is formed in an annular plug 3 fitted as a closesliding fit in a circular hole in the cylinder wall. Coiled compressionsprings l interposed between the plug 3 and a cap 5 fixed to thecylinder press the plug 3 radially inwards so that its inner end ispressed against the periphery of the ported sleeve [2 forming the wallof the combustion chamber. A sealing ring 6, acting similarly to apiston ring, preferably encircles the plug 3 to ensure a tight seal inthe cylinder. The inner end of the plug 3 is carefully radiused so thatthe whole of its inner annular end wall bears against the ported sleeveI2.

The foregoing construction is suitable where a member such as the cap 5can be fitted against the cylinder wall, but in any case theconstruction shown in Figs. 1 and 3 constitutes the main characteristicof the invention. To apply the desired pressure to the ported plug undercertain special circumstances wherein the capsprings 5 and 4 are notapplicable, a pair of transverse spindles Iii are located so as tointersect diametrically opposed parts of the appropriate annular plug 3and are supported in suitable bores in the cylinder. At one end thespindles are provided with cranked levers 9 between which is interposeda coiled compression spring 8 tending to force said levers apart andthus rotate the spindles. Cams I I are formed on these spindles oppositeto the plug by the simple expedient of milling a flat thereon, wherebythese cams under the action of the spring 8 press the ported pluginwards against the sleeve l2.

As will be seen from Figure 2, the arrangement of the ported member issuch that a sealing action is had between the cylinder and sleeve andalso between sleeve and ported member. Since the sleeve has a workingclearance in the cylinder, it is therefore pressed thereagainst by theported member, at the diametrally opposed point devoid of ports; whilethe tension of said member against the sleeve assures a tight jointbetween sleeve and member.

What I claim is:

1. Means for eiiecting a seal between a ported part of a cylinder andthe ported sleeve of a sleeve valve internal combustion engine whereinthe said annular member is engaged at annular ends remote from thesleeve valve engaging ends by cams acted upon by compression springsfitted in the cylinder assembly.

2. In an internal combustion engine having a ported cylinder and aported sleeve valve, means for eiiecting a seal between said cylinderport and sleeve comprising an annular member slidable longitudinally inthe cylinder port, cams engaging diametrally opposite portions of saidmember, and a spring for actuating said cams in order to urge the membertowards the sleeve.

MARIUS JEAN-BAPTISTE BARBAROU.

